Stealth Design Bluetooth Headset, Perman Mini Ultra-Small S530 Bluetooth 4.0 Stereo Headset Earphone Earbud Rechargeable Pairing All Bluetooth Enabled Devices (Khaki ) Bluetooth profiles: Hands free / Headset. Small and light, stealth design. Can talk, listening to the music. Multi-point connections can be connected to two one with two Bluetooth devices simultaneously. Transmission range:10 m. Charging Power:AC input 110-240V DC output 5V (charging time / about 2 hours / charging voltage 3.7v) Battery type: 50mA rechargeable lithium battery. Dimensions: 3cmX1.7cmX1.2cm/1.19"X0.67"X0.48" Taiwan and the bluetooth master control chip. 2 in a row, to the telegraph, voice prompt operation. Built-in DSP audio processing system, can be a very good eliminate Noise and echo, to ensure clear communication, and music.